Sacrificial coating for fluoride ion cleaning

a technology of fluoride ions and coatings, which is applied in the direction of machines/engines, manufacturing tools, and solventing apparatus, can solve problems such as component cracking, and achieve the effect of minimizing inter-granular attack

Active Publication Date: 2011-02-08
RTX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The example method of repairing a defect in a gas turbine engine component therefore provides the benefit of minimizing inter-granular attack during chemical cleaning.

Problems solved by technology

Under such conditions, the gas turbine engine components may incur damage from erosion, creep, and high cycle fatigue that results in defects such as cracks.
Disadvantageously, the hydrogen fluoride gas preferentially attacks grain boundaries of a metallic microstructure of the gas turbine engine component, which may undesirably weaken the gas turbine engine component, lead to unsuccessful repair, and result in scrappage of the component.

Method used

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  • Sacrificial coating for fluoride ion cleaning
  • Sacrificial coating for fluoride ion cleaning

Examples

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Embodiment Construction

[0017]FIG. 1 illustrates selected portions of an example gas turbine engine component 10 such as a turbine vane. In this example, the gas turbine engine component 10 includes a defect portion 12, such as a microscopic crack.

[0018]FIG. 2 shows the defect portion 12 illustrated in FIG. 1. The defect portion 12 includes a crack 14 having a crack surface 16 with undesired impurities such as an oxide scale 18 and particles 20. The particles 20 may be, for example, titanium or aluminum based which, and under some conditions may form undesired oxides.

[0019]FIG. 3 illustrates steps used to repair the crack 14. Generally, the method includes a coating step 22, a cleaning step 24, and a brazing step 26. The crack 14 is coated in step 22 to resist inter-granular attack during the cleaning process. The crack 14 is then exposed to a cleaning gas such as hydrogen fluoride in step 24 to remove the oxidation scale 18 and undesired particles 20. Finally, in step 26 the crack 14 is filled with a braz...

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Abstract

A method of repairing a defect in a gas turbine engine component includes exposing the defect to a chemically reducing gas to clean the defect surface of undesired particles and oxidation. Before the cleaning, a protective coating is applied to the defect surface to resist inter-granular attack during the cleaning process.

Description

RELATED APPLICATIONS[0001]This application claims priority to Singapore Patent Application No. 200506795-4, filed Oct. 18, 2005.BACKGROUND OF THE INVENTION[0002]This invention relates to a method for repairing defects in gas turbine engine components and, more particularly, to utilizing a protective coating to resist inter-granular attack during chemical cleaning.[0003]Conventional gas turbine engines include components such as high and low pressure turbine vanes that operate for extended periods of time under relatively harsh conditions. Under such conditions, the gas turbine engine components may incur damage from erosion, creep, and high cycle fatigue that results in defects such as cracks. Typically, the defects can be repaired to extend the service life of the gas turbine engine component.[0004]Conventional repair methods include cleaning the defect to remove oxidation and particles that may hamper the repair. After the cleaning, a braze material such as a braze filler powder i...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C23C16/00B05D3/00B32B43/00
CPCB23K1/206B23P6/007B23P6/045C23G5/00C25D7/00F01D25/002B23K2201/001F05D2230/90F05D2230/80F05D2230/237B23K2101/001Y10T428/31678
Inventor NG, SOR TINANG, ENG SOONNEO, SENG WEEWOO, CHEE KINKONG, TIAN SIANG JASON
Owner RTX CORP
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